1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b43108fa3e22a545256710e5bef30a78a27d7e1a4ac3bd93e1a65c4e99e32d3. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2dc46b7e-1e55-4343-a8e3-32e00325ce1e.json and https://artists.proofprofile.net/proofs/artist/2dc46b7e-1e55-4343-a8e3-32e00325ce1e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf0a26d3a21a9c61b2dafc105dd1d495cd2d2e49c9505724f706ef83ba54224. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEVU52365095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255e648c61d5c436e4951c24f2156938c992a6cb3dd6389c8bdc2a95cad60c89. Chain 2 (Bitcoin): anchored in block 958124 (2026-07-15T08:13:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEVU52365158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425358e91ccde603372f3ae1c279fd0882818fc72daf04c18ec93c90a478c507. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM10300109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfedfaa7f2be9088e40a9edcff3a889a4d858a91f61224d80f100e765451431bc. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM10300110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c05e707ad91c0442860a2803066e1f319375fd23a8e87dbce5f9659587eed2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM10300111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd10b450ed9f3722cbb15630d7b899287b1c0f8a2534db4ff2f3552ed826cf49b. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM11704405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49d2e6bd0d577cc6a89745658c47252f67c8adaecb0821f31a5894859aa6064. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM10214749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3443238b02d20541d1fcfef0c00441d0f9d5ea56cb93c75d8d49640e5d9287a9. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM10214750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x754b836a687b35ab46e5a35db8f3b5820fd2a92763dae2ce083d181a095cb14e. Chain 2 (Bitcoin): anchored in block 958495 (2026-07-18T04:39:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM10214755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ce56b9529248fefa7824008cf8160bee1ca1abba7f085d99044c0ad862accf. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM10204005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd949bdaaf08c1aa5dba638ee6d13153c76010f1cb5a4ae8e9873999268ca4672. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM10204006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ea925cd4793f8946b81510413c977d5479b22aede32cb396e7c5baa5c0e5ce8. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM10204007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x380487ea17eefe66f0e88785900d5671997756ac94249e71a344555c5344d09c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM10204008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc0ea275b900662c19dcfc561111e5ff0345865652db567d809d86e96fe8ed7. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM17001047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3df3bf9873684d9a19162f777c7015cd5bba35fd823928b46a327270c2991c86. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM10204621.